JP4246036B2 - Method for producing powder detergent for clothes containing fluorescent brightener - Google Patents

Description

  The present invention relates to a method for producing a powder detergent for clothing containing a water-dispersed fluorescent whitening agent.

  Conventionally, fluorescent whitening agents blended in powder detergents are known to have high water solubility (for example, biphenyl type fluorescent whitening agent) and water dispersion type (for example, aminostilbene type fluorescent whitening agent). Yes. Among these, the advantages of the water-dispersed fluorescent whitening agent are inexpensive, high fluorescence intensity per mass, high dyeing property to cellulose, and little decrease in dyeing property in the presence of a nonionic surfactant. , Etc.

  Usually, in order to blend such a water-dispersed fluorescent whitening agent in a powder detergent, a method of blending and dispersing a water-dispersed fluorescent whitening agent in a slurry containing a surfactant and spray-drying it is a method. Taken. However, if a large amount of nonionic surfactant is added to the slurry, the adhesiveness of the spray-dried particles increases, so the ratio of the nonionic surfactant in the powder detergent is increased, for example, for the purpose of enhancing detergency. If desired, the nonionic surfactant is generally post-added to the spray dried particles rather than the slurry. In that case, since the surfactant concentration in the slurry is relatively reduced, it is difficult to uniformly disperse the water-dispersed fluorescent whitening agent. Accordingly, it is difficult to uniformly disperse and blend the water-dispersed fluorescent whitening agent in a composition in which the concentration of the nonionic surfactant is increased.

  On the other hand, it is conceivable to add the water-dispersed aminostilbene type fluorescent whitening agent as a powder. However, in a bleach-containing composition that has been increasing in recent years, the deterioration of the fluorescent whitening agent over time is sufficiently suppressed. It becomes difficult.

  From such a background, as a technique for blending a water-dispersed fluorescent whitening agent into a powder detergent, Patent Document 1 discloses a water-dispersed type in polyethylene glycol and / or a nonionic surfactant having an average molecular weight of 200 to 2,000. A method is disclosed in which an aminostilbene-type fluorescent whitening agent is dispersed and granulated or mixed while spraying the dispersion onto a detergent component.

  Patent Documents 2 to 4 disclose a method of dissolving or dispersing a fluorescent whitening agent in a nonionic surfactant and granulating this with other detergent components.

Further, Patent Document 5 was obtained by adding a polyethylene glycol melt having an average molecular weight of 12,000 to a granulated product obtained by introducing a nonionic surfactant into a fluorescent whitening agent and other powder detergent components. A method of mixing detergent dough and bleach components is disclosed.
JP 2000-96094 A Japanese Patent Laid-Open No. 7-286198 JP-A-9-241695 Japanese National Patent Publication No. 9-506122 JP-A-9-310097

  However, in the method of Patent Document 1, since a polymer compound having a low freezing point is used, there arises a problem that it is not possible to sufficiently prevent the nonionic surfactant from exuding from the final detergent particles. Also, in Patent Documents 2 to 4, similarly, the exudation of the nonionic surfactant cannot be sufficiently suppressed. Further, the method of Patent Document 5 has a problem in that the dispersion of the fluorescent whitening agent in the powder detergent is likely to be non-uniform, and the adhesion to clothing is uneven. For this reason, there has been a demand for a method that can uniformly mix the water-dispersed fluorescent whitening agent, particularly in a powder detergent containing a relatively large amount of a nonionic surfactant.

  An object of the present invention is to uniformly mix a water-dispersed fluorescent brightener in a powder detergent, particularly a powder detergent having a composition containing a large amount of a nonionic surfactant, and also in a composition containing a bleaching agent. Another object of the present invention is to provide a method for producing a powder detergent capable of preventing deterioration of the optical brightener over time.

  The present invention includes a dispersion containing (a) a water-dispersed fluorescent whitening agent (hereinafter referred to as component (a)) and (b) a water-soluble polymer compound having a melting point of 50 ° C. or higher (hereinafter referred to as component (b)). The present invention relates to a method for producing a fluorescent whitening agent-containing powder detergent for clothing, which comprises a step of adding a liquid (hereinafter referred to as dispersion liquid (I)) to a constituent of a powder detergent for clothing [hereinafter referred to as process (I)].

  According to the present invention, the water-dispersed fluorescent whitening agent can be uniformly blended into a powder detergent for clothing, particularly a powder detergent for clothing having a composition containing a large amount of nonionic surfactant, and also in a composition containing a bleaching agent. In addition, the temporal stability of the water-dispersed fluorescent brightener is improved.

<Dispersion (I)>
In the dispersion (I) used in the present invention, the total amount of the component (a) and the component (b) is 0.2 to 3.0% by mass, further 0.4 to 2.0% by mass, particularly 0.5 to It is preferable to contain 1.5 mass%. Usually, the dispersion medium of the dispersion liquid (I) is water, and can contain other liquid components and other detergent components. The content of the component (a) in the final powder detergent composition is 0.01 to 0.5% by mass, further 0.02 to 0.3% by mass, particularly 0.05 to 0.2% by mass. It is preferable to use as described above.

  Examples of the component (a) include dimorpholino type (stilbene type) fluorescent whitening agents and hydroxyethylamino type fluorescent whitening agents. Among them, dimorpholino type fluorescent whitening agents are preferable from the viewpoint of versatility. Dimorpholino-type optical brighteners include 4,4′-bis {(4-anilino-6-morpholino-1,3,5, -triazin-2-yl) amino} stilbene-2,2′-disulfonic acid diester. Sodium salt, 4,4′-bis {(4-toluidino-6-morpholino-1,3,5-triazin-2-yl) amino} stilbene-2,2′-disulfonic acid disodium salt, etc. In the present invention, the former dimorpholino type optical brightener is particularly preferred. Examples of the former dimorpholino type fluorescent whitening agent include Photine CBUS-560B (trade name, manufactured by Hixon), BRY-10 (trade name, manufactured by McTesim), Tinopal DMS-X (trade name, manufactured by Ciba Geigy), and the like. is there. If desired, the above-mentioned various water-dispersed fluorescent whitening agents may be used in combination.

  Examples of the component (b) include polyethylene glycol, polyvinyl alcohol, polyvinyl pyrrolidone, polyacrylate, and natural polymer compounds of cellulose derivatives represented by carboxymethyl cellulose. These have a melting point of 50 ° C. or higher, more preferably 55 ° C. or higher, particularly 60 ° C. or higher. The upper limit of the melting point is 150 ° C. or lower, further 120 ° C. or lower, particularly 90 ° C. or lower.

  In particular, in recent years, energy saving related to detergent production has been promoted. For example, the temperature during production is suppressed as much as possible, that is, the melting point of the water-soluble polymer alone is close to the temperature at which it is easy to handle in production, and fluorescent whitening. A polyethylene glycol having a weight average molecular weight of 4000 to 40000, more preferably 6000 to 20000 is preferred from the viewpoint that the agent dispersion has good stability over time and further excellent solidification properties. In the case of using a water-soluble polymer having a melting point of 90 ° C. or higher, such as polyvinyl alcohol, one previously dissolved in water can be used.

  In the dispersion liquid (I), for example, a predetermined amount of the component (a), the component (b), the component blended as necessary, and water are put into a mixing tank, and the distribution of each component becomes uniform. And can be prepared with stirring. For stirring, T.W. K. A disperser such as a homomic line mill S type (manufactured by Tokushu Kika Kogyo Co., Ltd.) is used. The temperature during stirring is preferably equal to or higher than the melting point of the component (b), and the temperature of the liquid component obtained by mixing is preferably 60 to 95 ° C, more preferably 70 to 90 ° C.

The dispersion (I) is prepared by adding and mixing the components (a) and (b) at the same time as the liquid component, while stirring the liquid component such as the component (b) from the viewpoint of dispersion efficiency. It can also be prepared by adding to the component (a). At this time, it is preferable to perform deaeration when handling properties are deteriorated due to mixing of bubbles. Moreover, it is preferable to make the particle size of undissolved component (a) powder small while making the concentrations of component (a) and component (b) (solvent) uniform.
<Process (I)>
As constituents of the powder detergent for clothing other than the components (a) and (b) used in the step (I), surfactants such as (c) nonionic surfactants (hereinafter referred to as (c) components) ], (D) anionic surfactants (hereinafter referred to as component (d)), alkaline agents, water-soluble fluorescent whitening agents, and the like.

  Among the surfactants, as the component (c), (c1) polyoxyalkylene alkyl ether, (c2) polyoxyalkylene (preferably having an alkylene oxide average addition mole number of 1 to 20) alkyl (preferably having an average carbon number of 6 to 6) 12) phenyl ether, (c3) fatty acid (preferably having 10 to 20 carbon atoms) alkanolamide or an alkylene oxide adduct thereof, (c4) ester of sucrose fatty acid (preferably having an average carbon number of 10 to 20), (c5) fatty acid ( Preferably, the average carbon number is 10 to 20) glycerol monoester and the like.

  Among these, (c1) is preferable, and specific examples of (c1) have an average alkyl group or alkenyl group having 10 to 20 carbon atoms and an average of 1 to 20 mol of ethylene oxide (hereinafter referred to as EO). Polyoxyethylene alkyl or alkenyl ether to which is added), poly having an average alkyl group or alkenyl group having 10 to 20 carbon atoms and an average of 1 to 20 mol of propylene oxide (hereinafter referred to as PO) Oxypropylene alkyl or alkenyl ether, polyoxybutylene alkyl or alkenyl ether having an average alkyl group or alkenyl group having 10 to 20 carbon atoms and having an average of 1 to 20 moles of butylene oxide added, having an average carbon number of 10 to 20 It has an alkyl group or an alkenyl group. EO and PO or EO and nonionic surfactant obtained by adding BO of (the ratio of the EO and PO or EO and BO is 0.1 / 9.9 to 9.9 / 0.1), and the like.

  The component (c) has a mass ratio of the component (b) to the component (c) in the final detergent composition (b) / (c) = 1/10 to 1/2, more preferably 1/9 to 1/3. It is preferably used so as to be 1/8 to 1/4. Moreover, after satisfy | filling this mass ratio, (c) component is 3-20 mass% in a final powder detergent composition, Furthermore, it is used so that it may become 5-15 mass%, especially 6-12 mass%. preferable.

  In addition, as the component (d), as an anionic surfactant, alkylbenzene sulfonate, alkyl or alkenyl ether sulfate, alkyl or alkenyl sulfate, α-olefin sulfonate, α-sulfo fatty acid salt or ester thereof , Alkyl or alkenyl ether carboxylate, fatty acid salt and the like. Alkali metal ions are preferred as counter ions in terms of improving detergency.

  Examples of the alkali agent include carbonates, silicates, amines (alkylamines, alkanolamines, etc.), and carbonates such as sodium carbonate and potassium carbonate, and silicates such as sodium silicate are preferred. The alkaline agent is preferably used in an amount of 10 to 40% by mass, and further 15 to 35% by mass, in the composition of the final powder detergent.

  Other ingredients include builders, water-soluble polymers, anti-staining agents, softeners, water-soluble fluorescent whitening agents, foam control agents, enzymes, enzyme stabilizers, colorants, fragrances, etc., known in the detergent field. Can be contained. Examples of inorganic builders include crystalline aluminosilicate, amorphous aluminosilicate, crystalline sodium silicate, sodium tripolyphosphate, sodium pyrophosphate, etc., and crystalline aluminosilicate in terms of environmental impact and cleaning performance Is more preferable. Crystalline aluminosilicates can also be used as surface modifiers. Moreover, as a water-soluble polymer, the component applicable to (b) component can be used separately from the part mix | blended with dispersion liquid (I).

  In the step (I), the constituent component of the powder detergent for clothing is preferably used as particles containing the component. The particles may be those obtained by spray-drying at least a part of the components in a slurry state, and stirring granulation, rolling granulation, kneading, mixed granulation, or the like and selected from polymers and water-soluble salts. One or more types of spray-dried particles that contain one or more water-soluble components and that are substantially free of surfactants, such as spray-dried particles that contain both a water-soluble polymer and a water-soluble salt. Base particles obtained by supporting a surfactant, particularly a nonionic surfactant, are preferred from the viewpoint of excellent solubility. That is, in the present invention, at least a part of the constituents of the powder detergent for clothing, that is, 15 to 100% by mass in the constituents are spray-dried particles obtained by spray-drying the slurry, and further component (c) Is preferably added to the spray-dried particles.

  The powder detergent according to the present invention can be obtained by adding the dispersion liquid (I) to the particles, usually by modifying with a surface modifier, and further adding components to be added later. When using the base particles as described above, the dispersion (I) is added to the base particles by spraying or the like, either simultaneously with the surfactant or before or after the surfactant. In addition, about these spray-drying methods and addition methods, if it is a well-known method, there will be no limitation in particular. The detergent particles obtained in this way are modified with a surface modifier and blended with general detergent auxiliaries such as enzymes, fragrances, components (e) and (f) described below, and a powder detergent. can get.

  The mass ratio of the surface coating agent to the detergent particles obtained in step (I) (hereinafter referred to as detergent particles (I)) is as follows: surface coating agent / detergent particles (I) = 1/15 to 1/3, 12 to 1/4, especially 1/10 to 1/4 are preferable. Examples of surface coating agents include aluminosilicates, calcium silicates, silicon dioxide, bentonite, talc, clay, amorphous silica derivatives, crystalline silicates and other silicate compounds, metal soaps, powder surfactants, etc. Fine powder, carboxymethyl cellulose, polyethylene glycol, polyacrylic acid soda, water-soluble polymers such as polycarboxylic acid salts such as copolymers of acrylic acid and maleic acid or salts thereof, and fatty acids. Among these, water-insoluble inorganic substances are preferable, and crystalline aluminosilicate, amorphous aluminosilicate, and crystalline silicate are particularly preferable.

  In addition, even if the powder detergent is manufactured by a process that does not perform spray drying such as the non-tower method, the component (a) can be uniformly dispersed compared with the case where the fluorescent brightener is added as a powder, and the powder detergent is not uniform. There is an advantage that no distribution occurs.

  The amount of the dispersion (I) to be added to the constituents of the powder detergent for clothing used in the step (I) is 0.5 to 8 parts by mass, further 1 to 4 parts per 100 parts by mass in total of the constituents. 5 parts by mass is preferred.

  The powder detergent for clothing according to the present invention comprises (e) a compound that releases hydrogen peroxide in water (hereinafter referred to as (e) component) and (f) an organic peracid that reacts with hydrogen peroxide in water. It can be set as the composition containing the compound [henceforth (f) component] to generate | occur | produce, In this case, the process (henceforth, adding these (e) component and (f) component after process (I). It is preferable to have step (II)]. The component (e) and the component (f) are preferably added to the mixture obtained by the step (I) as a granulated product containing these components (so-called after blending).

  Component (e) includes carbonate / hydrogen peroxide adduct, borate / hydrogen peroxide adduct, tripolyphosphate / hydrogen peroxide adduct, pyrophosphate / hydrogen peroxide adduct, urea / hydrogen peroxide. Examples include adducts. Of these, carbonate / hydrogen peroxide adduct and borate / hydrogen peroxide adduct are preferable, sodium carbonate / hydrogen peroxide adduct and sodium borate / hydrogen peroxide adduct are more preferable. Sodium / hydrogen peroxide adduct is more preferred. (E) It is preferable to use a component so that it may become 1.5-15 mass% in the composition of a final powder detergent, 2-12 mass%, especially 2-10 mass%.

  Further, as the component (f), bleaching of glucose pentaacetate, triacetin, N, N, N ′, N′-tetraacetylethylenediamine, tetraacetylglycolyluril and the like generally used in oxygen-based bleach-containing detergents An activator can be used, but at least one of the compounds represented by the following general formulas (f1) to (f4) is particularly preferable in terms of effects. (F) It is preferable to use a component so that it may become 0.1-15 mass% in the composition of a final powder detergent, also 0.2-13 mass%, especially 0.2-10 mass%.

[Wherein, R ₁ is an alkyl group having 4 to 13 carbon atoms, preferably 10 to 13 carbon atoms, R ₂ is an alkyl group having 5 to 13 carbon atoms, preferably 7 to 11 carbon atoms, M is a hydrogen atom or an alkali metal, alkaline earth It represents a similar metal, ammonium or alkanolamine. ]

[Wherein, R ₃ , R ₄ , R ₅ , R ₆ , R ₇ , R ₉ , R ₁₀ are each independently a methyl group, an ethyl group or a hydroxyethyl group, and R ₈ has 2 to 10 carbon atoms. An alkylene group, and X ⁻ represents an anion, preferably a halogen ion, an alkyl sulfate ion having 1 to 3 carbon atoms, a fatty acid ion having 1 to 12 carbon atoms, a phosphate ion, or a sulfate ion. ]
As a preferable final composition of the powder detergent for clothing obtained by the present invention, a surfactant having a total amount of 15 to 25% by mass and a bulk density of 0.6 to 1.0 g / cm ³ may be mentioned. It is preferable to adjust the composition of the dispersion liquid (I) and the composition of the constituent components (particles) of the detergent so as to be in such a range.

A specific procedure for producing a powder detergent by the method of the present invention will be described.
(1) A water slurry containing an alkali agent, a builder and the like is prepared. The slurry preferably has a surfactant content, particularly a nonionic surfactant content of 45% by mass or less. The production method of the present invention is particularly advantageous when the content of the surfactant, particularly the nonionic surfactant, in the slurry is small, that is, when it is 15% by mass or less. This is because it becomes difficult to uniformly disperse the water-dispersed fluorescent whitening agent in the slurry.
(2) The slurry is spray-dried to obtain spray-dried particles.
(3) A surfactant is supported on the spray-dried particles. The surfactant is preferably used as an aqueous solution (aqueous dispersion) containing a nonionic surfactant, an anionic surfactant and the like.
(4) Dispersion (I) containing component (a) and component (b) is prepared.
(5) The dispersion liquid (I) is added to the spray-dried particles carrying the surfactant by a method such as spraying [step (I)].
(6) Furthermore, a surface modifier such as zeolite is added to the spray-dried particles to which the dispersion (I) has been added to perform surface modification.
(7) (e) component and (f) component are added to the particles after surface modification, respectively, by adding granules, enzymes, fragrances and the like [step (II)], for clothing of final composition Obtain a powder detergent.

  In the powder detergent for clothes obtained by the method of the present invention, the component (a) is uniformly dispersed in the powder detergent, and adhesion to the clothes is also uniform. In addition, the composition containing the bleaching agent also improves the temporal stability of the component (a), which is considered to be because the surface of the component (a) is appropriately coated with the component (b).

Example 1
(1) 407 parts by mass of water was placed in a jacketed mixing tank, and 40 ° C. warm water was passed through the jacket. Sodium carbonate [Dense ash (average particle size: 290 μm), manufactured by Central Glass Co., Ltd.] 132 parts by mass, sodium sulfate [anhydrous neutral sodium sulfate (average particle size: 240 μm), manufactured by Shikoku Chemicals Co., Ltd.] 132 mass Part, sodium sulfite [sodium sulfite (average particle size: 90 μm), manufactured by Mitsui Toatsu Co., Ltd.] 5 parts by mass, 40% sodium polyacrylate aqueous solution [average molecular weight 10,000, manufactured by Kao Corporation] 72 parts by mass, water 1 part by weight of fluorescent fluorescent whitening agent (Chinopearl CBS-X, manufactured by Ciba Geigy) and 252 parts by weight of zeolite [Zeobuilder, 4A type, average particle size: 3.5 μm, manufactured by Tosoh Corporation] were sequentially added. Stir for 15 minutes to obtain a homogeneous pre-slurry at 40 ° C.
(2) Next, hot water at 60 ° C. was passed through the jacket and stirred for 30 minutes to obtain a preliminary slurry at a temperature of 60 ° C. of the preliminary slurry. The obtained slurry was supplied to a spray drying tower (counterflow type) with a pump, and sprayed at a spray pressure of 2.5 MPa from a pressure spray nozzle installed near the top of the tower. The hot gas supplied to the spray drying tower was supplied at a temperature of 210 ° C. from the bottom of the tower, and was discharged from the top of the tower at 105 ° C. The water content of the obtained spray-dried particles was 4% by mass.
(3) Next, 100 parts by mass of the spray-dried particles were put into a readyge mixer (manufactured by Matsuzaka Giken Co., Ltd., capacity 130 L, with jacket), and the main shaft (rotation speed: 60 rpm, peripheral speed: 1.6 m / s) stirring was started. In addition, 80 degreeC warm water was poured by the jacket at 10 L / min. 50 parts by mass of a surfactant composition (polyoxyethylene alkyl ether / polyethylene glycol / sodium dodecylbenzenesulfonate / water = 21/4/21/4 (mass ratio)) heated to 80 ° C. in a Redige mixer Was added over 2 minutes, followed by stirring for 5 minutes. Here, as polyoxyethylene alkyl ether, Emulgen 108KM manufactured by Kao Corporation (average added mole number of ethylene oxide: 8.5, carbon number of alkyl chain: 12 to 14) was used. As polyethylene glycol, K-PEG6000 (average molecular weight: 8500) manufactured by Kao Corporation was used.
(4) Next, 60 parts by mass of polyethylene glycol (weight average molecular weight 13000, melting point 64 ° C.), 10 parts by mass of dimorpholino type (stilbene type) fluorescent dye (Macthesim BRY-10), and biphenyl type fluorescent dye (Ciba Specialty Chemicals) Chino Pearl CSB-X) 10 parts by mass and 30 parts by mass of water are premixed. K. Ready 2.5 parts by mass of a polyethylene glycol / fluorescent brightener dispersion obtained by highly dispersing a homomic line mill S type (manufactured by Tokushu Kika Kogyo Co., Ltd.) with a rotation speed of 3600 rpm and a clearance of 0.4 mm Sprayed into a Gemixer and mixed for 10 minutes. The final temperature of the polyethylene glycol / fluorescent dye was adjusted to about 80 ° C. by controlling the jacket temperature of the premix tank and line mixer.
(5) Next, zeolite (Zeobuilder Co., Ltd., 4A type, average particle size: 3.5 μm) was added, and the surface was modified by stirring using a Redige mixer. Thereafter, using a rotary kiln, an enzyme (Novozymes Cannase 24T), sodium percarbonate granulation described in JP 2000-256699 A, sodium lauroyloxybenzenesulfonate granulation described in JP 2000-256699 A, and flavor Were blended to obtain a final powder detergent for clothing.
Comparative Example 1
In Example 1, 0.2 parts by weight of a dimorpholino-type (stilbene-type) fluorescent dye (Macthesim BRY-10) without adding a fluorescent brightening agent to the dispersion in (4) and 0.2 parts by weight The biphenyl type fluorescent dye (Ciba Specialty Chemicals Co., Ltd., Chino Pearl CSB-X) was put into a Redige mixer as a powder, and a powder detergent for final clothing was obtained in the same manner.
Comparative Example 2
In the same manner as in Example 1, except that polyethylene glycol in (4) having a weight average molecular weight of 1500 (melting point: 46 ° C.) was used and 1.4 parts by mass of the dispersion was used. Got.
Comparative Example 3
In Example 1, instead of the polyethylene glycol in (4), polyoxyethylene alkyl ether [Emulgen 108KM manufactured by Kao Corporation (average ethylene oxide addition mole number: 8.5, carbon number of alkyl chain: 12-2) 14, melting point 18 ° C.), and 1.4 parts by mass of the dispersion was used to obtain a final powder detergent for clothing.
<Evaluation>
Using a paperboard having a moisture permeability of 20 to 30 g / m ² · 24 hours measured according to JIS-Z0208, a box-shaped container having an open top of length × width × height = 145 mm × 90 mm × 57 mm was prepared. This container was filled with 300 g of the powder detergent for clothing obtained in the above examples or comparative examples. Thereafter, the sample was stored in a constant temperature and humidity chamber at a temperature of 50 ° C. and a relative humidity of 70% for 168 hours with the upper part opened. After storage, when the powder detergent for clothes inside the container was solidified, the particles were sufficiently consolidated and mixed sufficiently to be homogeneous.

  0.667 g of powder detergent for clothing before or after storage was dissolved in 1 L of 4 ° DH hard water adjusted to 20 ° C., and charged into a tartometer. Five pieces of 10 cm × 10 cm # 2023 test cloth (100% cotton, Tanigami store) from which the fluorescent dye was sufficiently removed in advance with chloroform / ethanol were put in and washed at 100 rpm. Next, the test cloth was taken out, hard water of 20 ° C. and 4 ° DH was put into another beaker of the tartometer, and the washed test cloth was put therein and rinsed for 3 minutes. The test cloth was dried in a dark room for 12 hours, and the fluorescence intensity (IF value) was measured using Nippon Denshoku Industries Co., Ltd. spectral color / whiteness meter PF-10. The results are shown in Table 1.

Claims (10)

(A) having a step of adding a dispersion at 60 to 95 ° C. containing a water-dispersed fluorescent whitening agent and (b) a water-soluble polymer compound having a melting point of 50 ° C. or higher to a constituent of a powder detergent for clothing, A method for producing a powder detergent for clothes containing a fluorescent brightening agent ,
At least a part of the constituents of the powder detergent for clothing is spray-dried particles obtained by spray-drying the slurry,
(C) adding a nonionic surfactant to the spray-dried particles,
A method for producing a powder detergent for clothing containing a fluorescent brightening agent. The process according to claim 1, wherein the surfactant content in the slurry is 45 wt% or less. The production method according to claim 1 or 2 , wherein a mass ratio of (b) to (c) is (b) / (c) = 1/10 to 2/1. The manufacturing method of any one of Claims 1-3 which contain (d) anionic surfactant as a structural component of the said powder detergent for clothing. The manufacturing method of any one of Claims 1-4 which contains 15-40 mass% of surfactant as a structural component of the said powder detergent for clothing. The production method according to claim 5 , wherein a ratio of (c) the nonionic surfactant in the surfactant is 10 to 50% by mass. The manufacturing method of any one of Claims 1-6 which contains a water-soluble fluorescent whitening agent as a structural component of the powder detergent for clothing. (E) a compound that releases hydrogen peroxide in water and (f) a compound that reacts with hydrogen peroxide in water to generate an organic peracid after the dispersion is added to the constituents of the powder detergent for clothing. manufacturing method of any one of claims 1 to 7 comprising the step of adding. (B) is polyalkylene glycol of the weight average molecular weight 3000-50000, The manufacturing method in any one of Claims 1-8 . The manufacturing method according to claim 1, wherein a dispersion medium of the dispersion liquid is water .